linux-ext4 - Re: block groups with no inode tables

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Date:	Wed, 11 Jul 2007 01:30:05 +0800
From:	coly li <colyli@...il.com>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: block groups with no inode tables

Hi, once we decide to do this, how about storing inode inside the
directory ?

IMHO, the latter one is more attractive :-)

Coly

在 2007-07-10二的 12:12 -0500，Jose R. Santos写道：
> Hi folks,
> 
> As I play with the allocation of the metadata for the FLEX_BG feature,
> it seems that we could benefit from having block groups with no inode
> tables.  Right now we allocate one inode table per bg base on the
> inode_blocks_per_group.  For FLEX_BG though, it would make more sense
> to have a larger inode tables that fully use the inode bitmap allocated
> on the first few block groups.  Once we reach the number of inode per
> FLEX_BG, then the remaining block groups could then have no inode
> tables defined.
> 
> The idea here is that we better utilize the inode bitmaps and reduce the
> number of inode tables to improve mkfs/fsck times. We could also
> support expansion of inode since we have block groups that have empty
> entries in the block group descriptors and as long as we can find
> enough empty blocks for the inode table expanding the number of inodes
> should be relatively easy.
> 
> Don't know if ext4 currently supports this.  Any thoughts?
> 
> -JRS
> -
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